Where to start? Firstly the historical basis for an independent Scotland (and Ireland, and even Wales) is rather stronger than that for an independent England, given that the UK was formed in part when the Scottish of the day seceded to the English. The English were the senior partner in the Union, so we have far less reason to want to leave.
Secondly, the single policy of wanting an independent England doesn't make you racist. The SNP has tied in its independence with a series of socialist policies so can't really be termed far right-wing by any measure on earth. If an ENP were formed and had the same set of policies it wouldn't be branded right-wing either. At least not accurately. If an ENP also aligned itself with policies such as some attempt to return to "purity", then it might be labelled racist, but then it would be. Independence isn't in itself facism or racism, it's the complete package that matters.
Thirdly, although it goes a bit far, you could regard the SNP as "little Scotlanders" anyway, so no difference there either. I think it wouldn't be exactly fair, but it's clear that at least one or two senior figures in the SNP, particularly Nicola Sturgeon, seem to be playing Independence as a chance to escape the vile clutches of evil Westminster.